Status report missing detection in a communication system

Abstract

A method to detect a lost status report determines that a second status report is required when an AMD PDU not negatively acknowledged in the first status report, an AMD PDU with a polling bit set, or the last negatively acknowledged AMD PDU is received after the expiry of a roundtrip timer and before all the negatively acknowledged AMD PDUs in the first status report are received. The method provides a deterministic way of detecting a lost status report, resulting in improved transmission throughput in a wireless communications system.

Description

CROSS REFERENCE To RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 481,374, filed Sep. 14, 2003, entitled “STATUS REPORT MISSING DETECTION FOR ACKNOWLEDGED MODE” and included herein by reference.BACKGROUND OF INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to wireless communications systems, and more specifically, to methods for packet-based communication in such systems. [0004] 2. Description of the Prior Art [0005] The surge in public demand for wireless communication devices has placed pressure upon industry to develop increasingly sophisticated communications standards. The 3rd Generation Partnership Project (3GPP™) is an example of such a new communications protocol. Such standards may utilize a three-layer approach to communications. Please refer to FIG. FIG. 1 is a block diagram of three layers in such a communications protocol. In a typical wireless environment, a first station 10 is in wi...

AI Technical Summary

Benefits of technology

[0019] It is an advantage of the claimed invention that the method is deterministic and adaptive to the transmission conditions of the communications system.

[0020] It is an advantage of the claimed invention that the method improves transmission throughput.

Problems solved by technology

In the noisy environment of wireless transmissions, however, the receiver 40, be it a base station or a mobile unit, often misses data.

Thus, ensuring that the layer 2 SDUs 44 are presented in order can pose a significant challenge.

However, one of the main drawbacks of the prior art is that the estimated number of received AMD PDUs within a TTI is uncertain.

Moreover, in hybrid automatic-repeat-request (HARQ) procedures used in high-speed downlink packet access (HSDPA), the VR(EP) count down process is inappropriate since a PDU may be in fact retransmitted in a medium access control (MAC) layer.

Other disadvantages of the above-described system may also become apparent in certain applications.

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